EP2302214B2 - Method and system for cooling a wind turbine structure - Google Patents

Method and system for cooling a wind turbine structure Download PDF

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Publication number
EP2302214B2
EP2302214B2 EP10177921.3A EP10177921A EP2302214B2 EP 2302214 B2 EP2302214 B2 EP 2302214B2 EP 10177921 A EP10177921 A EP 10177921A EP 2302214 B2 EP2302214 B2 EP 2302214B2
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EP
European Patent Office
Prior art keywords
tower
wind turbine
air
control
external air
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP10177921.3A
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German (de)
English (en)
French (fr)
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EP2302214A2 (en
EP2302214A3 (en
EP2302214B1 (en
Inventor
Meng GAO
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General Electric Co
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General Electric Co
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Publication date
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Publication of EP2302214A2 publication Critical patent/EP2302214A2/en
Publication of EP2302214A3 publication Critical patent/EP2302214A3/en
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Publication of EP2302214B1 publication Critical patent/EP2302214B1/en
Publication of EP2302214B2 publication Critical patent/EP2302214B2/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D7/00—Controlling wind motors 
    • F03D7/02—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/04—Automatic control; Regulation
    • F03D7/042—Automatic control; Regulation by means of an electrical or electronic controller
    • F03D7/043—Automatic control; Regulation by means of an electrical or electronic controller characterised by the type of control logic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
    • F03D13/20—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
    • F03D80/60—Cooling or heating of wind motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/20—Heat transfer, e.g. cooling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/728—Onshore wind turbines

Definitions

  • the present invention relates generally to the field of wind turbines, and, more particularly, to a system and associated control method for cooling a wind turbine structure, such as a tower or nacelle, that utilize a combination of regulated internal and external airflow for cooling components within the structure.
  • a modem wind turbine typically includes a tower, a nacelle rotatably supported on the tower, a generator and gearbox housed in the nacelle, and one more rotor blades.
  • the rotor blades capture kinetic energy from wind using known foil principles, and transmit the kinetic energy through rotational energy to turn a shaft that couples the rotor blades to the gearbox, or if a gearbox is not used, directly to the generator.
  • the generator then converts the mechanical energy to electrical energy that may be deployed to a utility grid. With the growing interest in wind generated electricity, considerable efforts have been made to develop wind turbines that are reliable and efficient.
  • a wind turbine comprises several mechanical and electrical components that generate heat energy losses during their operation. These components include, for example, the gearbox (if provided) and generator that are typically housed in the nacelle. Other heat-generating components may be housed in the tower. For example, a converter and a transformer are typically located in the tower and are utilized to feed electrical energy converted from the mechanical energy of the rotor via the generator into the grid. In addition, one or more controllers for controlling operation of the wind turbine are typically arranged within the tower.
  • WO 01/06121 describes a wind turbine unit having a closed cooling circuit therein.
  • a horizontal axis wind turbine (hereafter "wind turbine") 10 is illustrated in Fig. 1 .
  • the wind turbine 10 includes a tower 12, which supports the weight of a nacelle 14, blades 19 and rotor hub 18.
  • the tower 12 is often manufactured as a tubular steel structure, and may be erected by stacking multiple tower segments on top of each other. Towers may also be of the lattice (or truss) type, and tubular towers may alternatively be formed of concrete or other suitable materials.
  • the nacelle 14 typically houses the drive train (e.g., gearbox, shafts, couplings, generator, etc.), as well as a main frame (also called a "bedplate”) and yaw drives. Other items, such as the control electronics, may also be housed within the tower 12.
  • the nacelle 14 has an outer skin that is comprised of a lightweight material, such as fiberglass or graphite composite, that functions to protect the drive train and other components from the elements (e.g., rain, ice, snow, etc.).
  • control and power electronics 16 may be located within the tower 12, for example at the base of tower 12.
  • the control electronics may control the various operating modes (e.g., blade pitch angle, start-up or shut-down sequence, etc.) of the wind turbine 10.
  • the power electronics may include transformers and converters used to transform the voltage output of the generator into the proper form for transmission onto the electrical grid.
  • dampers 30 In order to define the extent of the recirculating internal airstream, it may be desired to include controllable dampers 30 within the ducts 28. These dampers 30 would allow for selective control of the internal air 20 drawn from the various segments of the tower 12 depending on the required cooling capacity or relative humidity control needed in the section of the tower 12 containing the components 16.
  • a control system 46 is in operable communication with the various internal air handling components 24 and components of the external air flow regulator 36.
  • the control system 46 augments the recirculating internal airstream with external air 22 by controlling the external air flow regulator 36 to increase the cooling capacity of the recirculating internal airstream while also balancing the amount of external air 22 introduced into the tower 12 with the amount of relatively hotter internal air so as to achieve a desired balance of temperature and relative humidity within the tower 12, particularly within the space occupied by the components 16.
  • the configuration of internal air handling components 24, such as the fan 26, dampers 30, ducts 28, and so forth may be controlled so as to vary the recirculating internal airstream within a range of essentially zero flow to an upper flow limit of the air handling components 24.
  • the volumetric flow rate of the internal airstream can be tuned to achieve the desired temperature and relative humidity within the structure.
  • the control system 46 establishes the internal temperature and relative humidity within the tower 12 as a function of measured or detected operational conditions that affect the required cooling capacity within the tower 12. These operating conditions may vary widely within the scope and spirit of the invention.
  • the operational conditions or parameters used as control variables by the control system 46 are power generation level of the wind turbine and external ambient temperature. As illustrated in Fig. 2 , ambient temperature may be measured by any conventional temperature detection device and supplied as an input 50 to a control circuit 47. Likewise, power generation level of the wind turbine 10 may be supplied as an input 48 to the control circuit 47. Any number or combination of other inputs 52 may be supplied to the control 47, including set points, control parameters, and the like.
  • the first operational scenario addressed in Table 1 is essentially zero power generation by the wind turbine and ambient temperature is either low (L) or high (H). It should be appreciated that the low or high temperature ranges may be any temperature between set point temperatures that define the two ranges. In an alternate embodiment, control may be a linear or other proportional function of ambient temperature.
  • the internal recirculating airstream is generally not needed for cooling components within the wind turbine structure.
  • the internal air handling components 24 may be controlled so as to stop or significantly reduce the internal recirculating airstream. It is also not necessary to augment the reduced or stopped internal airstream with external air.
  • the external air flow regulator 36 may also be configured to stop or significantly reduce the flow of external air 22 into the structure.
  • turbine power generation is at a partial level, which may be any level above zero power and below a defined load of the wind turbine.
  • Control may be linear within the defined power range, or step-wise based on sub-ranges.
  • Ambient temperature is low, and the internal air handling components 24 are configured to sustain the internal recirculating airstream at a defined set point rate that is a function of the power level and the temperature. So long as the ambient temperature remains at a set point "low" temperature, it is not necessary to augment the internal recirculating airstream with external air and the external air flow regulator components 36 are controlled accordingly.
  • the internal air handling components 24 are configured to maintain the internal recirculating airstream, which may be at a higher rate as compared to the last scenario due to the increased ambient temperature. Because of the high ambient temperature, external air may be needed to augment the cooling capacity of the recirculating internal airstream. Thus, the external air flow regulator components 36 are configured to open and provide an augmenting source of external air.
  • turbine power generation is at a full level and ambient temperature is low.
  • the internal air handling components 24 are configured to initiate and maintain the internal recirculating airstream, which may be at a greater level as compared to the previous scenarios due to the full power generation of the wind turbine.
  • the external air flow regulator components 36 are again configured to augment the internal recirculating airstream with relatively cooler external air. The external air will provide a significant cooling capacity to the airstream, but may be relatively humid. In this situation, the relatively hotter internal recirculating airstream may be sustained or increased primarily to control the relatively humidity within the tower 12.
  • turbine power generation is at a full level and ambient temperature is at a high level.
  • the external air flow regulator 36 may be configured for maximum external air flow.
  • the internal air handling components 24 may be configured to stop or significantly reduce the internal recirculating airstream so as not to introduce relatively hotter internal air into the compartment containing the components 16 that require cooling. In this situation, relative humidity within the tower 12 is not a concern due to the heat generated by the components 16 under full load.
  • control may variable based on a linear or other proportional function.
  • Fig. 3 illustrates another embodiment wherein the set of operational conditions used by the control system 46 for control of the internal air handling components 24 and external air flow regulator 36 are the temperature of a monitored component 16 to be cooled and relative humidity within the turbine structure.
  • component 16 includes any manner of conventional temperature monitoring device 42 that is in communication with a component temperature sensor 56 that supplies an input to the control circuit 47.
  • Any manner of conventional relative humidity detector 44 is included within the compartment of the tower 12 and is in communication with a relative humidity sensor 54 that supplies an input to the control circuit 47.
  • Fig. 4 is a flow diagram of a control scheme that may be utilized with the configuration of components in Fig. 3 .
  • This scheme generally reflects that the control system 46 controls the recirculating internal airstream as an initial function of the temperature of the monitored component 16 within the turbine structure. External air is not introduced into the structure until the temperature of the monitored component 16 reaches a set point temperature. After the introduction of external air 22 into the structure, the control system 46 controls the recirculating airstream as a function of relative humidity within the structure.
  • T corresponds to the temperature of the monitored component.
  • T1, T2, and T3 are set point temperatures.
  • H is the relative humidity within the structural compartment.
  • Hc is a set point relative humidity value at which corrosion becomes a concern.
  • T is compared to the first set point temperature T1. If T is less than T1, then the internal recirculating airstream is stopped or reduced at 102, and external air flow is generally not needed. If T exceeds T1, then T is compared to the second set point temperature T2 at 104. If T is less than T2, then the internal recirculating airstream is initiated and maintained at 106, but external air flow still may not be necessary. If T exceeds T2, then the external air flow regulator 36 is controlled to augment the internal recirculating airstream with external air at 108.
  • relative humidity H becomes a factor in the control scheme.
  • the monitored relative humidity H within in the compartment is compared to the set point humidity value Hc at 110. If the relative humidity H within the compartment is less than Hc, then the relatively hotter internal air is generally not needed to reduce relative humidity H and the internal air handling components 24 may be configured to stop or reduce the recirculating internal airstream at 112. If the monitored relative humidity H exceeds the set point value Hc, then the monitored temperature of the component is compared to the third temperature set point value T3 at 114. If the monitored temperature T is less than T3, then the internal air handling components 24 are configured to initiate the internal recirculating airstream so that the hotter internal air may be used to reduce the relative humidity H at 116. However, if T exceeds the temperature set point T3, then the internal recirculating airstream is stopped at 118 so that the relatively hotter internal air does not increase the temperature T of the monitored component.
  • the present invention also encompasses various embodiments of a control methodology for cooling components within a wind turbine structure in accordance with the principles discussed above.
  • the method includes establishing a recirculating airstream of internal air within the wind turbine structure.
  • the method controllably augments the recirculating airstream with external air to increase the cooling capacity of the recirculating airstream as needed.
  • the method balances the amount of external air introduced into the structure with the amount of hotter internal air within the structure so as to achieve a desired balance of temperature and relative humidity within the structure.
  • the given set of operational conditions may, in a particular embodiment, be the ambient temperature and power generation level of the wind turbine, wherein for a given power generation level, control of the internal recirculating airstream and the amount of external air introduced into the structure are a function of the ambient air temperature.
  • the ambient temperature may be divided into a plurality of temperature ranges
  • power generation level may similarly be divided into a plurality of power level ranges.
  • control set points are established for control of the internal recirculating airstream and the mount of external air introduced into the wind turbine structure. The control may be linear within the ranges, or held at a constant set point value for each of the respective ranges.
  • Control of the amount of external air introduced into the wind turbine structure may range from essentially zero or minimal external air to a maximum air flow capability of an external air flow regulator. This control may be linear within the given range, or controlled in a step-wise manner.
  • the methodology includes control according to temperature of a monitored component within the wind turbine structure and relative humidity within the structure.
  • the recirculating internal airstream is initially controlled as a function of the temperature of the monitored component in the structure, and external air is not introduced into the structure until the temperature of the monitored component reaches a set point temperature. After external air is introduced into the structure, the recirculating airstream is controlled as a function of relative humidity within the structure.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Wind Motors (AREA)
EP10177921.3A 2009-09-25 2010-09-21 Method and system for cooling a wind turbine structure Not-in-force EP2302214B2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12/566,935 US7837126B2 (en) 2009-09-25 2009-09-25 Method and system for cooling a wind turbine structure

Publications (4)

Publication Number Publication Date
EP2302214A2 EP2302214A2 (en) 2011-03-30
EP2302214A3 EP2302214A3 (en) 2014-02-19
EP2302214B1 EP2302214B1 (en) 2014-12-24
EP2302214B2 true EP2302214B2 (en) 2018-07-11

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Family Applications (1)

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EP10177921.3A Not-in-force EP2302214B2 (en) 2009-09-25 2010-09-21 Method and system for cooling a wind turbine structure

Country Status (8)

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US (1) US7837126B2 (ja)
EP (1) EP2302214B2 (ja)
JP (1) JP5727739B2 (ja)
KR (1) KR101735109B1 (ja)
CN (1) CN102032124B (ja)
AU (1) AU2010221786B2 (ja)
CA (1) CA2714839C (ja)
ES (1) ES2530246T5 (ja)

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CN102032124A (zh) 2011-04-27
ES2530246T3 (es) 2015-02-27
EP2302214A2 (en) 2011-03-30
US20100133824A1 (en) 2010-06-03
CA2714839A1 (en) 2011-03-25
CA2714839C (en) 2017-10-10
ES2530246T5 (es) 2018-10-15
EP2302214A3 (en) 2014-02-19
US7837126B2 (en) 2010-11-23
EP2302214B1 (en) 2014-12-24
JP5727739B2 (ja) 2015-06-03
KR20110033796A (ko) 2011-03-31
AU2010221786A1 (en) 2011-04-14
JP2011069363A (ja) 2011-04-07
CN102032124B (zh) 2014-06-25
KR101735109B1 (ko) 2017-05-12
AU2010221786B2 (en) 2016-03-17

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